In Hesiod's theogony, there are three elements: Chaos, Gaia(earth) and Eros(love). These three elements are not born of each other. They existed forever in the world and the order of their birth differed only in time. Of the first three gods, only Eros does not give birth to descendants. He unites and pushes the other forces into creation. Out of Chaos, Erebus and Nychta(night) were born and out of the union of the two, Aitheras(air) and Imera(day) were born. Gaia gives birth to Uranus(sky), who is as great as she is. She also gave birth to the Mountains and Pontus. From Gaia, the shaping of the world begins. She creates the universe by giving birth to its components. She gives Uranus some of his powers and from his sperm, she gives birth to the Ocean, Koios, Creus, Hyperion, Theia, Rhea, Themis, Mnemosyne, Phoebe, Tethys, Kronos. She also gave birth to the Titans, the Cyclopes, and the Hecatochiri(one hundred hands).
Uranus - Kronos - Zeus
Uranus loses his power by Kronos, who cuts off his genitals. From the blood of Uranus the Erinyes, the Giants, the Melies are born, and from his seed, Aphrodite is born. Uranus prophesies that Kronos will lose power to one of his children and for this reason, Kronos swallows every child born by his wife Rhea like Demeter, Hestia, Hera, Hades and Poseidon. When the turn of Zeus comes, Rhea gives Kronos a stone instead of the newborn Zeus and hides the child in a cave of Mount Dikti in Crete.
As Zeus grows up, he forces Kronos to take out his brothers from his belly. After some conflicts, Zeus takes over power and the era of Olympian Gods begins.
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